parallel make failure

We still seem to have some dependency issues with parallel builds. I 
just got this on a fresh F16 box against git tip, when running "make -j 3":
   ccache gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith   -Wdeclaration-after-statement -Wendif-labels   -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing   -fwrapv -g -pthread  -D_REENTRANT -D_THREAD_SAFE   -D_POSIX_PTHREAD_SEMANTICS -DECPG_COMPILE -I../include   -I../../../../src/interfaces/ecpg/include -I. -I. -DMAJOR_VERSION=4   -DMINOR_VERSION=7 -DPATCHLEVEL=0 -I../../../../src/include   -D_GNU_SOURCE -I/usr/include/libxml2   -c -o parser.o parser.c -MMD   -MP -MF .deps/parser.Po   parser.c:25:21: fatal error: preproc.h: No such file or directory   compilation terminated.


cheers

andrew